USA Mathematics and Statisticsematical Talent Search

This is a mathematics competition open to all U.S. middle and high school students. Problems are published on the website four times a year one month before solutions are due. Problems range in difficulty from being within the reach of most high school students to challenging the best students in the nation. Students may use any materials -- books, calculators, computers -- but all work must be their own. This year's special topic is expected value.

Open Wide and Trek Inside

Open Wide and Trek Inside has several objectives. The first is to help students understand major concepts related to oral health. By focusing on the science of the oral environment, the module goes beyond the traditional "brushing and flossing" curriculum and presents to students the ways science has helped people understand how to take proper care of their mouths and the structures within.
The second objective of the module is to engage students in the nature of science through inquiry. As st

BRUSHster

BRUSHster is an online painting machine for all ages. This shockwave interactive includes more than forty brushes and customizable size, transparency, texture, and stroke options. A rainbow palette, along with a toolbox of special effects that blur, ripple, smudge, blend, and fragment your designs help make BRUSHster a full-feature painting program. You can save up to eight paintings as you work, which makes it easy to backtrack if you change your mind. Saved images will remain active and "re-pa

Visualizing Cultures

Visualizing Cultures opens a window on modern times by wedding popular images and scholarly commentary in ways that were not technologically possible until recently. Focusing to date on Japan and Asia in the modern world, these units enable users to “see” historical moments as they were actually depicted for mass audiences at the time from various national, cultural, racial, ideological, and individual perspectives. The graphics themselves also reflect the evolving nature of different medium

The Fourth Paradigm: Data-Intensive Scientific Discovery

The book The Fourth Paradigm: Data-Intensive Scientific Discovery examines the impact that software and massive amounts of distributed data have had on the sciences. Collaboration using new Web 2.0 tools is facilitating entirely new forms of research depending heavily on how well its researchers collaborate with one another, and with technologists, in areas of eScience such as databases, workflow management, visualization, and cloud computing technologies.
The book examines how technology i

Tree of Life

Teachers, learners and science enthusiasts are invited to explore Life on Earth and share their learning by building ToL treehouses and publishing them on the Tree of Life. Broadening our contributor base and audience is part of our efforts to create an open access digital library about biodiversity. The ToL provides four different ways of interacting with ToL learning resources, from the least interactive (browsing) to the most interactive (becoming a treehouse builder and creating ToL treehous

A Colonial Legacy in Miskito Turtle Knowledge (Nicaragua)

Over the past several decades the increasing prevalence of natural resource crises has led many ecologists to seek alternatives to Western resource use paradigms. Primary amongst these alternatives are systems guided by indigenous knowledge (IK). It is commonly presumed that these systems represent institutions uncorrupted by the exploitative hand of Western culture and state domination and therefore hold the key to rectifying the unsustainable behaviors of Western societies.

Midpoint Theorem (Coordinate Geometry)

An interactive applet and associated web page that demonstrate how to find the midpoint of a line segment when the coordinates of the endpoints are given. The applet has two points on a Cartesian plane. As the user drags either point it continuously recalculates the midpoint of the line segment defined by them. The midpoint is shown both on the plane and as a continuously changing formula. The grid, axis pointers and coordinates can be turned on and off. The midpoint calculation can be turned of

Line definition (Coordinate Geometry)

An interactive applet and associated web page that show the definition of a line in coordinate geometry. The applet has two points that the user can drag. The two points define a line, and the user can see how the line changes when the points are moved. The grid, axis pointers and coordinates can be turned on and off. The applet can be printed as it appears on the screen to make handouts. The web page has a full definition of a line when the coordinates of the points defining it are known, and h

Introduction to Coordinate Geometry

A web page that introduces the concepts behind coordinate geometry. Can be used as a reference for students to learn about the topic when away from class. Has links to other related pages that contain animated demonstrations. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Intersecting straight lines. (Coordinate Geometry)

An interactive applet and associated web page that show how to find the intersection of two straight lines, given the equation for each. The applet sows two lines defined by two pairs draggable points. As any point is dragged the equations for the lines are derived and the point of intersection calculated. The web page shows worked examples using various line slopes, equation forms and unusual conditions, such as one line being vertical. The grid, axis pointers and coordinates can be turned on a

Intercept (b) of a line (Coordinate Geometry)

An interactive applet and associated web page that demonstrate the intercept (b) of a line. The applet has two points that define a line. As the user drags either point it continuously recalculates the intercept, the point where the line crosses the y-axis at x=0. Can be used in conjunction with the slope to derive the equation of a line. The grid, axis pointers and coordinates can be turned on and off. The intercept calculation can be turned off to permit class exercises and then turned back on

Horizontal line definition. (Coordinate Geometry)

An interactive applet and associated web page that show the definition of a horizontal line in coordinate geometry. The applet has two points that the user can drag which define a line. The line flagged when it is horizontal (slope=0) and the equation of the line is shown. The grid, details and coordinates can be turned on and off. The applet can be printed exactly as it appears on the screen to make handouts. The web page has a discussion on how to test for horizontal, the line equation and has

Equation of a line - point - slope form. (Coordinate Geometry)

An interactive applet and associated web page that demonstrate the equation of a line in point-slope form. The user can move a slider that controls the slope, and can drag the point that defines the line. The graph changes accordingly and equation for the line is continuously recalculated with every slider and / or point move. The grid, axis pointers and coordinates can be turned on and off. The equation display can be turned off to permit class exercises and then turned back on the verify the a

Equation of a line - slope and intercept form. (Coordinate Geometry)

An interactive applet and associated web page that demonstrate the equation of a line in coordinate geometry. The equation is in the form y=mx+b. The user can move two sliders that control a and b. The graph changes accordingly and equation for the line is continuously recalculated with every slider move. The grid, axis pointers and coordinates can be turned on and off. The equation display can be turned off to permit class exercises and then turned back on the verify the answers. The applet can

Distance between points

An interactive applet and associated web page that demonstrate how to find the distance between two points with given coordinates. The applet has two points on a Cartesian plane. As the user drags either point it continuously recalculates the distance between them. The distance is shown both on the plane and as a continuously changing formula. The grid, axis pointers and coordinates can be turned on and off. The distance calculation can be turned off to permit class exercises and then turned bac

Circumscribed rectangle, bounding box. (Coordinate Geometry)

An interactive applet and associated web page that show the definition and properties of the bounding box of a polygon or set of points. The bounding box is used in other entries to find area using the so-called box method. The grid, coordinates and calculations can be turned on and off for class problem solving. The applet can be printed in the state it appears on the screen to make handouts. The web page has a full definition of a bounding box when the coordinates of the points defining it are

Print blank graph paper

A page that allows you to print rectangular (cartesian) graph paper. You ca control if grid lines are printed and the position of the origin. By dargging the origin into any corner a single quadrant can be printed. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Constructing the Incenter of a triangle

An interactive applet and associated web page that provide step-by-step animated instructions on how to construct the incenter of a triangle. The animation can be run either continuously like a video, or single stepped to allow classroom discussion and thought between steps. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Finding the foci an ellipse

An interactive applet and associated web page that provide step-by-step instructions on how to find the foci of a given ellipse using a compass. The animation can be run either continuously like a video, or single stepped to allow classroom discussion and thought between steps. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.